Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/oid/UIDImpl.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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0
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1 package org.dancres.blitz.oid; |
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2 |
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3 import java.io.Serializable; |
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4 |
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5 import org.dancres.util.BytePacker; |
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6 |
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7 /** |
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8 A unique identifier which can be generated by an Allocator. |
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9 */ |
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10 final class UIDImpl implements OID { |
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11 static final int KEY_SIZE = 12; |
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12 |
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13 private transient byte[] theKey; |
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14 |
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15 private long theId; |
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16 private int theZoneId; |
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17 |
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18 UIDImpl(byte[] aKey) { |
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19 theKey = aKey; |
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20 |
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21 BytePacker myPacker = BytePacker.getMSBPacker(theKey); |
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22 theZoneId = myPacker.getInt(0); |
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23 theId = myPacker.getLong(4); |
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24 } |
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25 |
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26 UIDImpl(int aZoneId, long anId) { |
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27 theId = anId; |
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28 theZoneId = aZoneId; |
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29 } |
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30 |
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31 public int getZoneId() { |
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32 return theZoneId; |
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33 } |
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34 |
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35 public long getId() { |
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36 return theId; |
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37 } |
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38 |
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39 synchronized byte[] getKey() { |
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40 if (theKey == null) { |
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41 theKey = keyFor(theZoneId, theId); |
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42 } |
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43 |
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44 return theKey; |
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45 } |
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46 |
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47 public String toString() { |
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48 return " " + theZoneId + "->" + theId; |
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49 } |
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50 |
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51 public int hashCode() { |
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52 /* |
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53 We include theZoneId to allow for the fact that all allocators for |
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54 a given Entry type will be allocating id's close to each other |
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55 because of the random allocator selection used when an id is |
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56 generated. Because the id's are allocated evenly, there's a high |
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57 chance of two UID's allocated close together in time colliding unless |
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58 we also factor in theZoneId. |
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59 */ |
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60 return theZoneId ^ ((int) (theId ^ (theId >>> 32))); |
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61 } |
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62 |
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63 public int compareTo(Object anObject) { |
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64 UIDImpl myOther = (UIDImpl) anObject; |
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65 |
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66 if (theZoneId < myOther.theZoneId) |
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67 return -1; |
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68 else if (theZoneId > myOther.theZoneId) |
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69 return 1; |
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70 |
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71 if (theId < myOther.theId) |
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72 return -1; |
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73 else if (theId > myOther.theId) |
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74 return 1; |
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75 else |
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76 return 0; |
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77 } |
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78 |
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79 public boolean equals(Object anObject) { |
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80 if (anObject instanceof UIDImpl) { |
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81 UIDImpl myOther = (UIDImpl) anObject; |
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82 |
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83 return ((theZoneId == myOther.theZoneId) && |
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84 (theId == myOther.theId)); |
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85 } |
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86 |
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87 return false; |
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88 } |
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89 |
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90 private byte[] keyFor(int aZoneId, long anId) { |
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91 byte[] myKey = new byte[12]; |
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92 |
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93 BytePacker myPacker = BytePacker.getMSBPacker(myKey); |
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94 myPacker.putInt(aZoneId, 0); |
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95 myPacker.putLong(anId, 4); |
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96 |
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97 return myKey; |
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98 } |
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99 } |